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The derailment of a train carrying toxic chemicals in East Palestine, Ohio has become a political football, but now we have an idea of what may have caused it: an overheating wheel bearing. Here's more from the National Transportation Safety Board's just-released interim report:

Crew members on the freight train that derailed in Ohio earlier this month, unleashing a huge blaze and spreading dangerous chemicals, tried to slow and stop the train after seeing an alert about an overheating wheel bearing, but it came off the tracks, according to an interim report released on Thursday by the National Transportation Safety Board (NTSB).